package com.ch.gulimall.product.service.impl;


import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ch.common.utils.PageUtils;
import com.ch.common.utils.Query;

import com.ch.gulimall.product.dao.CategoryDao;
import com.ch.gulimall.product.entity.CategoryEntity;
import com.ch.gulimall.product.service.CategoryBrandRelationService;
import com.ch.gulimall.product.service.CategoryService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Autowired
    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成父子结构的树形结构

        //2.1 找到所有的一级分类
        List<CategoryEntity> leveOne =
                entities.stream()
                        .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                        .map((menu) -> {
                            menu.setChildren(getChildrenAll(menu, entities));
                            return menu;
                        })
                        .sorted(Comparator.comparingInt(menum -> (menum.getSort() == null ? 0 : menum.getSort())))
                        .collect(Collectors.toList());
        return leveOne;
    }

    /**
     * 检查当前删除的菜单，是否被别的地方引用
     *
     * @param asList
     */
    @Override
    public void removeMenuByIds(List<Long> asList) {
        // TODD
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> list = new ArrayList<>();
        findParentPath(catelogId, list);
        return (Long[]) list.toArray(new Long[list.size()]);
    }

    @Transactional
    @Override
    public void updateDetail(CategoryEntity category) {
        this.updateById(category);
        if (!StringUtils.isEmpty(category.getName())) {
            categoryBrandRelationService.updateCatelog(category.getCatId(), category.getName());
        }
    }

    private void findParentPath(Long catelogId, List<Long> list) {
//        1.收集当前id
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid() != 0) {
            findParentPath(byId.getParentCid(), list);
        }
        list.add(catelogId);
    }

    /**
     * 递归查找所有的菜单的子菜单
     *
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrenAll(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> collect = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map((categoryEntity -> {
            categoryEntity.setChildren(getChildrenAll(categoryEntity, all));
            return categoryEntity;
        })).sorted(Comparator.comparingInt(menum -> (menum.getSort() == null ? 0 : menum.getSort()))).collect(Collectors.toList());
        return collect;
    }
}
